Sound Waves

In terms of microwaves themselves, the dangers are largely limited to the effects of the heat generated when the microwaves interact with human tissue. The greatest risk of high power microwaves is to the eyes, where the heat cannot be quickly removed by the cooling effect of the blood supply. Hence, corneas are particularly vunerable to micriwave heating. The testes in males are also vulnerable, although it is generally less likely that they will be exposed to microwaves.

In terms of microwave oven use, there are two principle dangers - The first is superheated liquids (liquids above their normal boiling point), which can flash-boil when, for example, instant coffee, sugar, or any other power is added. The second (and at one time the cause of most microwave oven accidents) comes from exploding unbroken eggs, as the yolk heats so efficiently that, even if the egg doesn't explode in the microwave, it can explode in the user's face when it is removed from the microwave oven.

There are no reliable reports of adverse health effects from low-level microwaves from such things as mobile phones or telecom masts.

Airplanes do not use sonar waves. Sonar is a technology primarily used underwater to detect objects or measure distances by emitting sound waves. Airplanes generally use radar technology to detect and track objects in the sky.

Scroll down to related links and look for "Closed or Gedackt Organ Pipes - Wikipedia". Organ builders still tend to use feet rather than metres when dealing with organ pipe length and tone e.g. an 8 foot pitched pipe is the same pitch as a piano, and is called '8 foot' because the longest pipe of the rank at this pitch ( the C below the C below Middle C) is 8 feet long. A 4-foot pipe is an octave higher, a 2 foot 2 octaves higher, and a 16 foot rank an octave lower than piano pitch. The fundamental tone of 16.4 Hz represents a 32-foot organ pipe, which is found, except in the very largest organs, only in the pedal section of large instruments. Although the 32 foot pitch is found frequently on large instruments (like cathedral organs) it is not the deepest note of an organ as stated in the question. Some organs, such as the Atlantic City Auditorium organ, USA and Liverpool Cathedral Organ in the UK have 64-foot ranks giving the lowest note as 8.2 Hz. On most organs offering 64-foot ranks, the sound is either produced by a stopped 32-foot pipe, or acoustically, where two shorter pipes are tuned so that the beats between them produce a 64-foot tone. Many huge organs do have a 64' rank (usually called gravissima), but nearly all of them are produced by either a stopped 32' or acoustically. There are not more then 5 organs that has a true (not acoustic, stopped, nor digital), (only counting the rank(S) that accually goes down to the sub-sub-contra C) 64 foot rank, three of them are the organ at the Atlantic City Convention Hall Main Auditorium, the organ at Sydney City Hall, and the one at Worcester Cathedral, in UK. The shortest lengh that will produce 16.4Hz (CCCC) is 16 ft, although this note is the C of the sub-contra octave, this 16ft pipe is stopped on the top, so it produces the note that corresponds to twice that lengh(32ft) . Also should be mentioned, the lowest (true) note on an acual organ is CCCCC which is 8 Hz, that single note cannot be heard alone. THE lowest note is produced by either stopping the 64' or combining the 64' and the fifth(42 2/3) to produce a 128' CCCCCC which is 4 Hz. Ｔhe　lowest note is produced by combinding a stopped 64' ( 128') and stopped 42 2/3' (85 1/3') to produce a resultant 256' which is 2Hz on CCC CCC C, this note is not considered audible by the human ear

Pitch is the frequency at which an object vibrates to create a sound. A tuning fork, for example, that vibrates 440 times a second will produce a perfect "A" note. It is these predetermined levels of frequencies that pitch is categorized into the twelve chromatic musical tones.

If the high frequency sound is within hearing range, you can hear it as a high-pitched sound. If it's out of the hearing range you can't hear it, of course.

Sound is vibration transmitted through a solid, liquid, or gas. To see sound waves as longitudinal waves in air moving, scroll down to related links and look at "Longitudinal wave - Wikipedia".

No, you can not produce sound in a vacuum. Sound wave needs medium (for example air) to travel unlike electromagnetic wave which can travel through empty space.actually, sound wave does not propagate itself rather it needs a medium by which sound particle can transfer there energy from one place to other, so it seems like moving.

for eg. when u throw a stone in water ,some ripples form in water they seems to moving but not. like this sound propagate.

hence it requires medium

The pitch of sound refers to how high or low a sound is perceived. It is determined by the frequency of the sound wave, with higher frequencies corresponding to higher pitch and lower frequencies corresponding to lower pitch.

Sound is the shape of the sound wave. Not influenced by, is. Another way of saying that is "The shape of a sound wave affects how rough or smooth that sound sounds". For example: a pure sine wave (which looks similar to a capital letter "S" lying on its side) sounds smooth whilst a pure square wave ( |--|--|--|--|--|-- ) sounds rough. A jagged, sawtooth-shaped sound wave ( \/\/\/ ) sounds "harsh", somewhere between smooth and rough. People speak of the "harshness" of a sound. Another way of describing the quality of a sound is its "timbre". If you really want to be able to explain and understand how the shape of a sound wave affects its quality or timbre you'll find there is a lot of electronics and musical instrument technology to be studied. To start, why not see if you can borrow some books such as "How a music keyboard works" and "How to design a music synthesiser" from the library?

Sound waves are waves of energy created by the vibration of a source (vibrating phone, vocal cords, etc.) that travel through a medium (air, water, solids). This means that the plant will get extra energy aside from sunlight that will make it grown at faster rates. It depends how fast those sound waves travel (frequencies) and how loud the sound waves are. Hope that answers your question!

The four basic wave interactions are reflection, refraction, diffraction, and interference. Reflection occurs when a wave bounces off a surface, while refraction involves the bending of a wave as it passes through a different medium. Diffraction is the bending of waves around obstacles, and interference is the interaction of waves, leading to their reinforcement or cancellation.

sound waves are compression waves, or longitudinal waves. sounds that we hear are actually just compressions and rarefactions of air particles, meaning the air particles move closer together for a time period then spread apart farther then they normally would rarefaction)

SONAR was invented to detect underwater threats, such as submarines and mines, during World War I. It uses sound waves to detect objects underwater by emitting pulses of sound and listening for echoes. SONAR has since been used for various applications, including navigation, mapping the seafloor, and studying marine life.

Compression happens during the part of the sound wave where the air particles are pushed closer together, resulting in an increase in air pressure. This creates a region of higher pressure within the sound wave, causing the compression of the air particles.

Moving is a relative fact: an object moving in a reference system (for example a train as observed from the station by a still observer) can be still in another reference system (for example the same train as seen by a car moving with the same velocity).

What is relevant is to accelerate (for example to start a movement in a reference where the object was still or to stop it). To accelerate a force is needed.

In empty space accelerating is essentially possible due to the so called momentum conservation law.

It states that the product of mass by velocity of an insulated system (no relation with other systems) cannot change in absence of forces.

Let us consider a car on a road: the force rotating the wheels comes from the car: it cannot directly change the car velocity. However, the contact between the wheels and the road causes a reaction from the road due to attrition. This is an external force: the car is not an insulated system and it can accelerate or stop.

In empty space this kind of propulsion is not possible.

Let us consider a rocket. Due to the action of the engine it trows out a mass (for example m1) in unit time from the jet at a speed v1.

The system before expulsion has a momentum (m+m1) v, where m is the rocket mass after the expulsion and v the rocket speed before the expulsion.

It has to be equal after the expulsion, thus, calling v2 the speed after the expulsion and considering that the mass m1 have a speed -v1 (opposite to the rocket direction) it is

(m+m1) v = m v2 -m1 v1

thus the velocity after the expulsion is v2=( (m+m1) v+m1 v1)/m > v. An acceleration has been obtained and the rocket increases its velocity :-))

The expulsion can be due to different causes, it depends on the used engine. Generally it is caused by a liquid fuel used in a turbine.

Yes as a matter of fact it can. for example take two stones and go to a like throw one in the water and shortly after throw the other one within three feet of the first stone. Now view the ripples. Like sound the ripples crated from one emission can effect and enlargen the ripples from another.

No, animals have different ranges of hearing. Some animals can hear higher frequencies than humans, while others can hear lower frequencies. Additionally, some animals can hear sounds at much greater distances than humans.

For any wave, the wavelength,l = c/f. Rearranging this, f=c/l. The speed of sound at room temperature is about 300 m/s, so an 8 m wave would have frequency of 300 m/s /8 m =37.5 cycles/s, a little bit lower than the E string on a bass guitar, which is the same as the fifth white key on a piano.

Inonu Stadium located in Istanbul, Turkey is home to soccer club Besiktas JK. During a Champions League match versus Liverpool on October 24, 2007, Besiktas fans, better known as Carsi, were recorded at 132 decibels. This is the highest recorded and documented sound level at a soccer stadium, everything else is hear-say. I was one of the lucky people who witnessed this feat and believe me the whole place was vibrating from the noise. To put the magnitude of the sound into perspective 132 decibels is somewhere between the sound of a jumbo jet taking off in your living room and lightening striking one meter away from you.

Sound waves travel through the outer ear, middle ear, and inner ear before they reach the brain. In the outer ear, sound waves are collected by the ear canal and directed to the eardrum. Then, in the middle ear, the sound waves cause the three tiny bones (hammer, anvil, and stirrup) to vibrate. Finally, in the inner ear, the vibrations are transformed into electrical signals that are sent to the brain via the auditory nerve.

Sound travels at about 330m/s in normal air.

First put 40km into metres which is 40,000m.

We can then rearrange the distance=speed x time equation to time=distance/speed.

After this we can just substitute in the values so that time=40,000/330=121.21212

Therefore it would take 121.21 seconds (about two minutes) for sound to travel 40km.